Abstract An adaptive structure for a phased antenna array is proposed using shape memory alloy (SMA) as an actuation component for the plate flatness control. Fiber Bragg Grating (FBG) sensors are designed for plate strain measurement, and a strain displacement transformation method is introduced to obtain the deformation field from the strain measurement data. The deformation field is then used to determine the correction loads of actuation points using integer nonlinear programming analysis. An adaptive prototype for the phased antenna array plate is developed with the distribution of monitored, actuation, and load points. Numerical simulations are performed to demonstrate the detailed process of the strain displacement transformation method. Moreover, the method is further discussed after testing the adaptive plate structure with the digital image correlation (DIC) technology. Finally, the reliability and efficiency of the proposed active control scheme are validated with an experimental setup. The study promotes the engineering application of the active control concept in large scale phased antenna arrays.

中文翻译：

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一种SMA束相控阵天线自适应结构的研制与实验验证

摘要 提出了一种相控天线阵列自适应结构，该结构使用形状记忆合金（SMA）作为平板平面度控制的驱动元件。光纤布拉格光栅（FBG）传感器设计用于平板应变测量，并引入应变位移变换方法从应变测量数据中获取变形场。然后使用变形场通过整数非线性规划分析确定驱动点的修正载荷。开发了相控天线阵列板的自适应原型，其中包含监控点、驱动点和负载点的分布。进行数值模拟以演示应变位移变换方法的详细过程。而且，在用数字图像相关（DIC）技术测试自适应板结构后进一步讨论该方法。最后，通过实验设置验证了所提出的主动控制方案的可靠性和效率。该研究促进了有源控制概念在大规模相控天线阵列中的工程应用。